TPU Covestro 9385

TPU Covestro 9385 is thermoplastic polyurethane elastomer featuring high transparency and excellent surface finish. It delivers good hydrolysis resistance, favorable weather resistance, as well as low‑temperature elasticity and flexibility.

Main Applications

Extruded parts requiring low‑temperature performance: hoses, tubes, films. Articles demanding high transparency: benefit from high clarity & superior surface gloss. Outdoor goods: take advantage of UV‑resistant property.

Physical Properties

Property Category	Item	Test Condition	Test Standard	Typical Reference Data	Unit
Physical Properties	Density	—	ISO 1183	1.20	g/cm³
Mechanical Properties	Shore Hardness	—	ISO 868	85	Shore A
	Tensile Strength	—	ASTM D412	25.5	MPa
	Elongation at Break	—	ASTM D412	770	%
	Flexural Modulus	23℃	ASTM D790	18.6	MPa
	Tear Strength	—	ASTM D624	60.5	kN/m
Thermal Properties	Glass Transition Temperature	—	—	‑57	℃
	Vicat Softening Temperature	—	ASTM D1525	75	℃
Other Properties	Compression Set	22 h	ASTM D395B	30	%
	Abrasion Loss	—	ASTM D3489	7	mg
	Molding Shrinkage (flow direction)	—	ASTM D955	0.008	mm/mm

Processing Parameters

Process	Parameter	Unit	Reference Range	Remarks
Pre‑drying	Drying temperature	℃	80‑110	Circulating hot‑air drying recommended; TPU is moisture‑sensitive, drying is mandatory
	Drying time	h	≥3	Until moisture＜0.05%
	Material bed thickness	mm	≤30	Guarantee drying efficiency
Injection molding	Rear feed zone temp	℃	150‑175	Avoid long‑term material residence under high temperature
	Middle compression zone temp	℃	160‑185
	Front metering zone temp	℃	170‑195
	Nozzle temperature	℃	Equal‑to‑slightly lower than front zone	Prevent drooling or cold‑plug blockage
	Melt temperature	℃	170‑195	Strictly prohibit＞240℃ to avoid degradation
	Mold temperature	℃	25‑45
	Injection pressure	bar	50‑100	Keep as low as possible while full filling
	Hold‑pressure	bar	30%‑60% of injection pressure	Excessive hold‑pressure & long hold‑time shall be avoided to reduce internal stress
	Screw speed	rpm	50‑100	High speed causes shear overheating
	Back pressure	bar	5‑15	Improve melt homogeneity; excessive back‑pressure generates extra heat

Note: All information above is for reference only!